Siemens 6MD85, Manual

Page: 609 / 1256

This parameter is not visible in the basic stage.
The recommended set value of
0.95
is appropriate for most applications.
To achieve high-precision measurements, the setting value of the parameter
Dropout ratio
can be
reduced, for example, to
0.98
. If you expect highly fluctuating measurands at the response threshold, you
can increase the setting value of the parameter
Dropout ratio
. This avoids chattering of the tripping stage.
Parameter:
1-pole operate allowed
•
Default setting
(_:661:11) 1-pole operate allowed
=
no
The parameter must be set for the specific application.
Parameter Value Description
no
The stage always operates 3-pole.
yes
The stage operates phase-selectively. However, tripping by the 6MD85 (generated in
the trip logic of the function group Circuit-breaker) is always 3-pole because the
device does not support phase-selective tripping.
Tripping by the 6MD86 is 1-pole using the 1-/3-pole circuit-breaker. The decision as to
which poles of the circuit-breaker to open is not made until central trip command
control becomes involved.
Settings
Addr. Parameter C Setting Options Default Setting
General
_:661:1 Definite-T 1:Mode
•
off
•
on
•
test
off
_:661:2 Definite-T 1:Operate &
flt.rec. blocked
•
no
•
yes
no
_:661:11 Definite-T 1:1-pole
operate allowed
•
no
•
yes
no
_:661:26 Definite-T 1:Dynamic
settings
•
no
•
yes
no
_:661:27 Definite-T 1:Blk. w.
inrush curr. detect.
•
no
•
yes
no
_:661:8 Definite-T 1:Method of
measurement
•
fundamental comp.
•
RMS value
fundamental
comp.
_:661:120 Definite-T 1:I0 elimina-
tion
•
no
•
yes
no
_:661:3 Definite-T 1:Threshold 1 A @ 100 Irated 0.030 A to 35.000 A 1.500 A
5 A @ 100 Irated 0.15 A to 175.00 A 7.50 A
1 A @ 50 Irated 0.030 A to 35.000 A 1.500 A
5 A @ 50 Irated 0.15 A to 175.00 A 7.50 A
1 A @ 1.6 Irated 0.001 A to 1.600 A 1.500 A
5 A @ 1.6 Irated 0.005 A to 8.000 A 7.500 A
_:661:4 Definite-T 1:Dropout
ratio 0.90 to 0.99 0.95
_:661:102 Definite-T 1:Pickup delay 0.00 s to 60.00 s 0.00 s
_:661:101 Definite-T 1:Dropout
delay 0.00 s to 60.00 s 0.00 s
_:661:6 Definite-T 1:Operate
delay 0.00 s to 60.00 s 0.30 s
7.4.4.3
Protection and Automation Functions
7.4 Overcurrent Protection, Phases
SIPROTEC 5, High-Voltage Bay Controller, Manual 609
C53000-G5040-C015-9, Edition 11.2017